Problems with double-sided printing

[Su41]

We recently had to change our router. All of a sudden our wireless printer (hp 6950) is not printing correctly double sided. The second page always seems to have a blank space at the top so nothing lines-up. Can anyone help please?

[sandytechy20]

@Su41

Welcome to the HP support community.

I understand that you are unable to print double-sided, but I am glad to assist you.

This seems to be a driver issue, uninstall the printer driver from the root level and reinstall to fix the issue.

Perform root level uninstallation to remove all the printer related software's.

• In Windows, search for and open Programs and Features.
• Select your HP printer.
• Select Uninstall.
• In Windows, search for and open Devices and Printers.
• In the Devices and Printers window look for your HP Printer. If you see it listed, right-click on it and choose "Delete" or "Remove Device.”
• Open up the run command with the "Windows Key + R" key combo.
• Type printui.exe /s and click OK.
• Click on Drivers tab.
• Look for HP Printer driver. If you see it click on it and click Remove at the bottom.
• Select OK.
• Remove all instances of the same.
• Select Apply and OK on the Print Server Properties windows.
• Close Devices and Printers. 
• Restart the PC again.

Download and install the printer using the HP Smart app

Click here to download the driver

Update the printer firmware to install the latest updates

Here are the steps:- Click here

Keep me posted.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.